Unable to Bring up internet explorer

I have an insperion 1520. I recently had a lot of problems with my computer so I reformatted my hard drive. Everything seems to be working fine except my wirless. My computer finds my network and says it it connected and the signal is excellent but I cannot get onto internet explorer. The start page comes up but it tells me it cannot find the web page. Any help would be appreciated. Thanks

I tried the IEFIX but apparently I do not have the right disk. I used the one I got with my computer. I am able to get onto IE if I hardwire the computer to my router. It is just when I try to get on with wireless. I am going to load Mozilla with the hard wire and see if that will help.